Table 2 Univariate and multivariate Cox regression analysis for the overall survival of ethnic Chinese patients

Age

The younger

Reference

Reference

The older

3.406(2.178–5.326)

< 0.001

1.967(1.205–3.210)

0.007

Marital status

Currently married

Reference

Never married

0.722(0.413–1.264)

0.254

SDW

1.260(0.785–2.022)

0.339

Year of diagnosis

2004–2009

Reference

Reference

2010–2016

1.466(0.961–2.237)

0.076

1.443(0.909–2.291)

0.119

Laterality

Unilateral

Reference

Reference

Bilateral

3.726(2.515–5.519)

< 0.001

1.849(1.164–2.938)

0.009

Grade

I

Reference

Reference

II

2.522(0.718–8.851)

0.149

1.436(0.350–5.898)

0.616

III

5.739(1.795–18.347)

0.003

1.508(0.388–5.867)

0.553

IV

6.277(1.929–20.423)

0.002

1.241(0.320–4.812)

0.755

Histology

CCOC

Reference

Reference

HGSOC

1.747(1.033–2.956)

0.038

0.479(0.251–0.912)

0.025

LGSOC/MOC/EC

0.365(0.174–0.764)

0.008

0.390(0.164–0.930)

0.034

FIGO

I

Reference

Reference

II

1.972(0.749–5.190)

0.169

2.132(0.787–5.775)

0.136

III

6.275(3.441–11.442)

< 0.001

3.588(1.705–7.550)

0.001

IV

8.244(4.224–16.092)

< 0.001

4.382(1.877–10.227)

0.001

Surgery

No surgery/Uncomplete surgical staging

Reference

Reference

Complete surgical staging/Cytoreductive surgery

1.684(1.092–2.597)

0.018

1.579(0.934–2.670)

0.088

LN_dissected

No or examined

Reference

Reference

1–10

0.497(0.308–0.802)

0.004

0.605(0.349–1.048)

0.073

≥ 11

0.388(0.248–0.605)

< 0.001

0.450(0.266–0.761)

0.003

Chemotherapy

No/Unknow

Reference

Yes

0.676(0.416–1.101)

0.116

Radiation

None/Unknown

Reference

Beam radiation

0.565(0.139–2.291)

0.424